Article continues below advertisementDr. Drew believes hard drugs are to blame for Nick Reiner's alleged murdering spree.On an episode of the podcast "The Adam and Dr. Drew Show," he suggested the 32-year-old was on "meth" when he allegedly killed his parents, Rob and Michele Reiner.Article continues below advertisementSource: Adam Carolla/YouTubeDr. Drew reacted to the Reiners' murders."I'm going to posit that I smell meth in the play here because of the violence and the knives," Dr. Drew speculated.